PartsTable
Technical Data Sheet
Download PDF

12S1-21-1AA — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12S1-21-1AA: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN, material: STEEL COMP 4037 STUD, drive_type: SLOTTED, stud_diameter: 0.122 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, stud_assembly_style: STUD ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-249-5986, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
12S1-21-1AA
NSN: 5325-00-249-5986
FSC: 5325 — Fastening Devices
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN
materialSTEEL COMP 4037 STUD
drive_typeSLOTTED
stud_diameter0.122 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeSPRING
eyelet_outside_diameter0.344 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
turnlock_stud_head_styleFILLISTER
material_accommodated_thickness0.275 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE STUD
surface_treatment_document_and_classificationQQ-P-416A,CLASS 2,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL A
NSN5325-00-249-5986
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12S1-21-1AA · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416A,CLASS 2,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL A
•
EYELET OUTSIDE DIAMETER: 0.344 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
•
DRIVE TYPE: SLOTTED
•
MATERIAL ACCOMMODATED THICKNESS: 0.275 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE STUD
•
DIAMETER: 0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN
•
SECURING DEVICE TYPE: SPRING
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 0.579 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416A,CLASS 2,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL A
EYELET OUTSIDE DIAMETER0.344 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
DRIVE TYPESLOTTED
MATERIAL ACCOMMODATED THICKNESS0.275 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE STUD
DIAMETER0.294 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN
SECURING DEVICE TYPESPRING
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.579 INCHES NOMINAL IN
TURNLOCK STUD HEAD STYLEFILLISTER
SURFACE TREATMENTCADMIUM OVERALL
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES 1
STSEC007AS21Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy 12S1-21-1AA?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 12S1-21-1AA?
12S1-21-1AA is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 12S1-21-1AA?
There is 1 known substitute for 12S1-21-1AA: STSEC007AS21. Substitute compatibility should be verified for your specific system.
What is the NSN for 12S1-21-1AA?
12S1-21-1AA is cataloged in the U.S. Government catalog under NSN 5325-00-249-5986. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 12S1-21-1AA

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.